Whats your opinion of the best gun in Rainbow Six Vegas 2? Why?

Ive tried some guns and all all the ones i chose arent too good. The ones Ive tried have SO much recoil and I can never hit anybody (ex. Aks-74u with silencer, Ak-74, and others.) if its not the recoil its their damage or accuracy? So whats your opinion of the best gun and why?